1–16 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
GROUND DIRECTIONAL OVERCURRENT (67G)
Directionality: .......................................................Co-existing forward and reverse
Polarizing:...............................................................Voltage, Current, Dual
Polarizing Voltage:..............................................V_0 or VX
Polarizing Current:.............................................. Isg
Operating Current:.............................................Ig
Level Sensing:.......................................................Ig, Isg
Characteristic Angle:.........................................-90º to 90º in steps of 1°
Limit Angle:............................................................40º to 90º in steps of 1°, independent for forward and
reverse
Angle Accuracy: ..................................................±2º
Pickup Level: .........................................................0.050 to 30.000 x CT in steps of 0.001
Level Accuracy: ...................................................50:0.025A CT: For 0.5A to 4A: ±0.1A; For > 4A: ±0.2A
Dropout Level:......................................................97 to 98%
Operate Time (no direction transition): ....< 12 ms typical at 3 x Pickup at 60 Hz
< 15 ms typical at 3 x Pickup at 50 Hz
SENSITIVE GROUND DIRECTIONAL OVERCURRENT (67SG)
Directionality: .......................................................Co-existing forward and reverse
Polarizing:...............................................................Voltage, Current, Dual
Polarizing Voltage:..............................................V_0 or VX
Polarizing Current:.............................................. Ig
Operating Current:.............................................Isg
Level Sensing:.......................................................Ig, Isg
Characteristic Angle:.........................................-90º to 90º in steps of 1°
Limit Angle:............................................................40º to 90º in steps of 1°, independent for forward and
reverse
Angle Accuracy: ..................................................± 2º
Pickup Level: .........................................................0.005 to 3.000 x CT in steps of 0.001 x CT
Dropout Level:......................................................97 to 98%
Operate Time (no direction transition): ....< 12 ms typical at 3 × Pickup at 60 Hz
< 15 ms typical at 3 × Pickup at 50 Hz
SENSITIVE GROUND INSTANTANEOUS OVERCURRENT (50SG)
Operating Parameter: ......................................Isg (Fundamental Phasor Magnitude)
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
0.50 to 15.00 A in steps of 0.01 A (For 50:0.025)
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ...................................................For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Level Accuracy: ...................................................For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
For 50:0.025: ±0.1A for 0.5A to 4A; ±0.2A for > 4A
Operate Time: ......................................................< 12 ms at 3 × Pickup at 60 Hz
Timer Accuracy:..................................................±3% of operate time or ± ¼ cycle (whichever is greater)
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